Process and means for undercutting and sealing laminated glass or the like



May 9, 1333. F. M. GREGG ET AL Filed May 2, 1931 IROCESS AND MEANS FOR UNDERCUTTING AND SEALING LAMINATED GLASS OR THE LIKE INVENTQRS FRANK M GREGG. BY Fl/MA/VMCAMPBELL ll/LE5 MYATF 1 M M ATTORNEYS Patented May 9, 1933 UNITED, STATES P A'l' ENTOFFICE 2mm: n. GRnG ruam 1v. cmnnm. am) auras Iran, or aas'rmm, comwnc'rrcur, assrenons 'ro. BESSIE L. GREGG, or near HAVEN, oommc'rrcur YBOCESS AND IOR' AND SEALING LAMINATED GLASS OR THE 3 Application filed lay 2, 1931. Serial No. 534,570.

This invention relates to methods and apparatus for undercutting and sealing the edges of laminated glass comprising a plulo rating agents it is desirable to apply to the edges some form of waterproofing or sealing materiaL- It has been found that in order to make the waterproofing or sealing material adhere permanently it is desirable 5 to remove-a narrow strip ofthe binding material from between the edgedof the glass laminations so that the sealing' material may be readily applied in the groove thus formed between the glass edges. 9 Among the objects of this invention are the method and apparatus for removing a narrow strip of the binding material from between the edges of theglasslaminations at a rapid rate, and to leave the groove thus 5 formed clean of the sealing material and of any gelatinous or other material that may have been used to cause the layer of nitrocellulose to adhere to the glass.

Other objects of this invention relate to' o the method and apparatus for preheating the groove so that the material which is preferably applied h1 hot, will flow into close contact with the walls of the groove constituted by the inner surfaces of 5 he edges of the glass laminations and the surface of the ,cellulose.

Still other objects of this invention relate to the method of and apparatus for under- 3 cutting'the laminated glass to clean groove, and for heating t e groove prior tothe-application of the sealing-material.

Still-other objects of this invention relate 5 to the method of and apparatus for performing the undercutting and sealing operations simultaneously upon a plurality of sheets of laminated lass.

Various other an more specific objects, features and advantages will more clearly edge of the layer of nitro-.

rovide a appear from the detailed description taken Fig. 4 is a top plan view of the preheat ing and sealing mechanism; and

1g. 5 1s a view showing mechanismfor simultaneously operating on the corresponding edges of a plurality of superimposed sheets of laminated glass.

In our application, Ser. No. 435,437, filed March 13, 1930, for Sealin means and process and apparatus for app ying same to will travel between the o posed surfaces on the edges of the glass lammations to remove the layer of nitro-cellulose bindin material between the lass laminations. is disk is preferably eated in any suitable snanner to the proper temperature.

In orderto speed up the operation oi undercutting, according to this inventi0n,'=

we employ three disks, 1, 2 and 3, arranged m'tandem as indicated in' Figures 1, 2 and which are parallelto each other and lie the same plane. As shown in Figs. 1, 2 and gas flames having been s of 3, the disk 1 is preferably of a smaller di-j ameter than the disks 2 and 3 and is of a a width slightly less than the thickness of the a layer of binding material. The disks 2 and 3 are preferably relatively thin as. indicated.

Aszindicated by the arrows inFigs. 1 and 2, the .first part of the cutting operation is performed by the disk-1 which removes most of the edge of the layer of binding material between the edges of the glass laminathe edges of laminated glass or the like,--'- there is disclosed an undercutting disk which I is mounted at an angle to its supporting shaft so that its cutting and burning edgetions. It has been found desirable to make this disk-of a slightly smaller diameter than cut the laminated glass and the disks 2 and 3 operating to finish the cutting operation.

As shown in Figs. 1 and 2, the laminatedsheet of glass 4 is shown as traveling from the left to the right with respect to the disks 1, 2 and 3. This operation may be performed bv any suitable mechanism not shown or, if desired, disks 1, 2 and 3 may be mounted to travel from right to left with res ect' to the sheet of laminated glass.

5 in the application referred to, the disks 2 and 3 are preferably mounted angularly on their shafts so that the portion that burns away the binding material travels or wobbles between the opposed surfaces of the edges of the layers of glass 5. and 6 to cut out the layer of bindin material 7, as is well understood. These isks 2 and 3 are preferably angularly related to each other as indicated more articularly in Figs. 2 and 3. By means 0 this construction it is possible to accordingly speedup the operation of undercutting and to provide a substantially clean and uniform groove in the edge of the laminated glass.

-As shown in Fig, 4, the walls of the groove may be preheated b means of a disk 8 which may be heate in any suitable manner as by a gas flame, as shown. The temperature of the disk 8 is preferably high enough/to heat the groove to the required rature but not hot enough to cause the material to burn or the glass layers 5:. As the sheet of laminated glass is moved to the right it passes over the disk 8 to heat the grooved edge 9 and while the oove is still heated any suitable kind of ated sealing material in a container 0 is bin applied in the groove by means of the disk 10, as indicated diagrammatically in Fig. 4.-

As the side walls and the bottom of the groove are heated at the time the sealing material is applied the sealing material will flow into close contact with the glass as well as with the edge of the sealing material,

thus preventing the trapping of air between the-sealing material and the binding material which has been found to result in a silver streak showing between the edge of the layer of binding material and the inner edge or bottom of the sealing material.

In order to further speed up the operation of treating laminated glass, as shown ,in Fig. 5, we superimposea plurality of sheets of laminated glass as indicated at 11, 12, 13, 14 and 15, such sheets being preferably separated by layers of soft material such as felt indicated at 16, 17, 18 and 19. The corresponding ed es of the laminated sheets which are to treated first are crating on a plurality of sheets of glass at one time, the disks that perform the same function on the several sheets of glass are, as indicated in Fig. 5 at 21, 22, 23, 24 and- 25, preferably mounted on a common vertical shaft 26 in order to-simplify the mechanism and to obtain uniform operation of the several disks upon the respective sheets of laminated glass.

While the mvention has been described with particularity in respect to certain npreferred steps and embodiments, it wi be understood by those skilled in the art after understanding the invention, that various changes and modifications may be made without departing from the spirit and scope of the invention and it is intended therefore J in the appended claims to cover all such chan es and modifications.

atweclaimis:- Y i 1. A step in the process of treating lami-' nated glass comprising plates of glass and an interposed layer of transparent material defining in connection with said lates a groove, which consists in heating t e walls of the groove in which sealing material is. to be applied .and then applying the sealing 'material while said walls are still heated.

2. A step in the process of treatin laminated glass provided with a groove edge which consists in raising the temperature 0 the grooved edge above normal outside temperature and then in ap lying in said groove sealing material raised to a temperature above normal outside temperature.

3. A step in the process of treating laminated glass comprisin a pair of plates of glass and an inte se layer of transparent material of sma er dimension providing with the plates of glass a groove along the edge of the laminated glass, which consists in heating the edge ofthe interposed layer and then applying heated sealing material on to said edge while the edge is still hot.

4. The combination of a heated element operable in a groove in the edge of laminated glass for raising the temperature thereof and means for subsequently applying sealing material in said reheated oov'e.

5. The com ination o a reheatin disk 0 erable in a roove in the e ge of laminated g ass, and a dlsk also operable in said groove for applying heated sealing material in said groove while the groove is still hot.

6. The combination of angularly related disks for cutting out the edge of material interposed between plates of glass constituting laminated glass, one of said disks operating on said material in the plane of said materlal and the other on said material at 265 aligned vertically, as shown in .Fig- 5, and an angle to said plane, a heated disk open 

